Runoff change of Naoli River in Northeast China in 1955–2009 and its influencing factors |
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| Authors: | Xiaolin Song Xianguo Lu Zhengmao Liu Yonghe Sun |
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| Institution: | Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3. Heilongjiang Agricultural Reclamation Survey, Design and Research Institute, Harbin 150090, China; 4. Jiamusi Hydrological Bureau in Heilongjiang Province, Jiamusi 154000, China) |
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| Abstract: | Runoff change and trend of the Naoli River Basin were studied through the time series analysis using the data from the hydrological
and meteorological stations. Time series of hydrological data were from 1957 to 2009 for Bao’an station, from 1955 to 2009
for Baoqing station, from 1956 to 2009 for Caizuizi station and from 1978 to 2009 for Hongqiling station. The influences of
climate change and human activities on runoff change were investigated, and the causes of hydrological regime change were
revealed. The seasonal runoff distribution of the Naoli River was extremely uneven, and the annual change was great. Overall,
the annual runoff showed a significant decreasing trend. The annual runoff of Bao’an, Baoqing, and Caizuizi stations in 2009
decreased by 64.1%, 76.3%, and 84.3%, respectively, compared with their beginning data recorded. The wet and dry years of
the Naoli River have changed in the study period. The frequency of wet year occurrence decreased and lasted longer, whereas
that of dry year occurrence increased. The frequency of dry year occurrence increased from 25.0%–27.8% to 83.9%–87.5%. The
years before the 1970s were mostly wet, whereas those after the 1970s were mostly dry. Precipitation reduction and land use
changes contributed to the decrease in annual runoff. Rising temperature and water project construction have also contributed
important effects on the runoff change of the Naoli River. |
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| Keywords: | runoff change hydrological parameters wetland land use human activities Naoli River |
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